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Scientific article
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English

Direct photon cross section with conversions at CDF

ContributorsCDF Collaboration
Publication date2004
Abstract

We present a measurement of the isolated direct photon cross section in pp¯ collisions at s√=1.8  TeV and |η|<0.9 using data collected between 1994 and 1995 by the Collider Detector at Fermilab (CDF). The measurement is based on events where the photon converts into an electron-positron pair in the material of the inner detector, resulting in a two track event signature. To remove π0→γγ and η→γγ events from the data we use a new background subtraction technique which takes advantage of the tracking information available in a photon conversion event. We find that the shape of the cross section as a function of photon pT is poorly described by next-to-leading-order QCD predictions, but agrees with previous CDF measurements.

Citation (ISO format)
CDF Collaboration. Direct photon cross section with conversions at CDF. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2004, vol. 70, n° 07, p. 074008. doi: 10.1103/PhysRevD.70.074008
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Article (Published version)
accessLevelPublic
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ISSN of the journal1550-2368
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